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Title: Supramolecular Organization of the Repetitive Backbone Unit of the Streptococcus pneumoniae Pilus

Journal Article · · PLoS ONE
 [1];  [2];  [3];  [4];  [3];  [3];  [3];  [3];  [5];  [3];  [3];  [2];  [3];  [3];  [3]
  1. Genomics Inst. of the Novartis Research Foundation, San Diego, CA (United States); DOE/OSTI
  2. Genomics Inst. of the Novartis Research Foundation, San Diego, CA (United States)
  3. Novartis Vaccines and Diagnostics, Siena (Italy)
  4. Genomics Inst. of the Novartis Research Foundation, San Diego, CA (United States); Novartis Vaccines and Diagnostics, Siena (Italy)
  5. Univ. of Siena (Italy). Dept. of Evolutionary Biology

Streptococcus pneumoniae, like many other Gram-positive bacteria, assembles long filamentous pili on their surface through which they adhere to host cells. Pneumococcal pili are formed by a backbone, consisting of the repetition of the major component RrgB, and two accessory proteins (RrgA and RrgC). Here we reconstruct by transmission electron microscopy and single particle image reconstruction method the three dimensional arrangement of two neighbouring RrgB molecules, which represent the minimal repetitive structural domain of the native pilus. The crystal structure of the D2-D4 domains of RrgB was solved at 1.6 Å resolution. Rigid-body fitting of the X-ray coordinates into the electron density map enabled us to define the arrangement of the backbone subunits into the S. pneumoniae native pilus. The quantitative fitting provide evidence that the pneumococcal pilus consists uniquely of RrgB monomers assembled in a head-to-tail organization. The presence of short intra-subunit linker regions connecting neighbouring domains provides the molecular basis for the intrinsic pilus flexibility.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
AC03-76SF00098
OSTI ID:
1627409
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 6 Vol. 5; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Group B Streptococcal Pilus Proteins Contribute to Adherence to and Invasion of Brain Microvascular Endothelial Cells journal October 2006
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Assembly of Distinct Pilus Structures on the Surface of Corynebacterium diphtheriae journal February 2006
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Pneumococcal Pili Are Composed of Protofilaments Exposing Adhesive Clusters of Rrg A journal March 2008
Dual Role for Pilus in Adherence to Epithelial Cells and Biofilm Formation in Streptococcus agalactiae journal May 2009
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Combining the polymerase incomplete primer extension method for cloning and mutagenesis with microscreening to accelerate structural genomics efforts journal January 2008
A New Generation of the IMAGIC Image Processing System journal January 1996
EMAN: Semiautomated Software for High-Resolution Single-Particle Reconstructions journal December 1999
Pili in Gram-negative and Gram-positive bacteria — structure, assembly and their role in disease journal October 2008
Multivariate statistical classification of noisy images (randomly oriented biological macromolecules) journal January 1984
Angular reconstitution: A posteriori assignment of projection directions for 3D reconstruction journal January 1987
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Accurate determination of local defocus and specimen tilt in electron microscopy journal June 2003
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Protective Activity of the CnaBE3 Domain Conserved among Staphylococcus aureus Sdr Proteins journal September 2013
Plasmid Characterization and Chromosome Analysis of Two netF+ Clostridium perfringens Isolates Associated with Foal and Canine Necrotizing Enteritis journal February 2016
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